A new concept in constructed wetlands: assessment of aerobic electroconductive biofilters,Environmental Science: Water Research & Technology

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A new concept in constructed wetlands: assessment of aerobic electroconductive biofilters
Environmental Science: Water Research & Technology ( IF 3.5 ) Pub Date : 2020-03-12 , DOI: 10.1039/c9ew00696f
Arantxa Aguirre-Sierra _{1,

2,

3,

4,

5} , Tristano Bacchetti-De Gregoris _{1,

2,

3,

4} , Juan José Salas _{4,

6,

7} , Andrés de Deus _{3,

4,

5,

8} , Abraham Esteve-Núñez _{1,

2,

3,

4,

5}

Affiliation

The METland® concept constitutes a hybrid concept for treating wastewater where microbial electrochemical technologies (MET) are integrated with constructed wetlands (CW) to enhance pollutant removal. Although electroactive bacteria (EAB) were thought to be restricted to anaerobic environments, we decided to explore alternative aerobic conditions like those found in down flow vertical CW. Two electroconductive (EC) biofilters fed with real urban wastewater were operated under downflow (aerobic) and upflow (anaerobic) conditions. The objective was to evaluate the impact of the operational mode on both the removal of pollutants and the microbial community profile. Surprisingly, despite the aerobic nature of the downflow EC biofilter, our results revealed an abundance of EAB from the Geobacter genus, opening a new scenario for treating wastewater based on stimulating extracellular electron transfer. Furthermore, the co-presence of Geobacter and Thiobacillus suggests the existence of interspecies electron transfer leading to nitrate respiration in our system. Moreover, the downflow EC biofilter outperformed the anaerobic upflow one in terms of COD, BOD₅ and nitrogen removal.

中文翻译：

人工湿地的新概念：需氧导电生物滤池的评估

METland®概念构成了处理废水的混合概念，其中微生物电化学技术（MET）与人工湿地（CW）集成在一起以增强污染物的去除。尽管人们认为电活性细菌（EAB）仅限于厌氧环境，但我们还是决定探索其他有氧条件，例如在垂直流CW中发现的有氧条件。在下流（好氧）和上流（厌氧）条件下运行了两个装有实际城市废水的导电（EC）生物滤池。目的是评估操作模式对污染物去除和微生物群落特征的影响。令人惊讶的是，尽管下流式EC生物滤池具有好氧特性，但我们的结果显示，来自Geobacter的EAB丰富属，开创了一种基于刺激细胞外电子转移处理废水的新方案。此外，Geobacter和Thiobacillus的共存表明种间电子转移的存在导致我们系统中的硝酸盐呼吸。此外，就COD，BOD ₅和氮去除而言，EC向下流生物滤池的性能优于厌氧向上流。

更新日期：2020-03-12

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